In the original post, Dima has used the word 'supposedly' to describe the presence of a khanjharli in the photo. This would suggest to me that he is not the one claiming the mysterious weapon in the photo (not the chilanum which is clearly visible) is a khanjharli. Who knows who might have suggested it is one of these.
As this is an 1860s carte de visite, these photo cards were all the rage in these times, and were taken either in studios, or more commonly by itinerant photographers who had with them selections of props including weapons.
In the abundant numbers of soldiers from the Civil War here, most are taken with the man holding a Colt M1851 revolver and a Bowie knife. The same weapons are probably in similarly posed photos of countless subjects.
The focus on the image here and whatever weapon he has at his side is moot, and what the objective is to find a warrior wearing a khanjharli which CAN BE SEEN AND RECOGNIZED

Fascinating lessons and interesting psychology though.